US3628895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid fuel pumping apparatus
Assignee: ZF International UK Ltd
•
Filing: 1969-11-04
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Granted: 1971-12-21
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Expires: 1989-11-04
Abstract
Abstract A fuel injection pump of the rotary distributor type and which includes a distributor in which is provided a passage having a delivery valve which closes at the end of an injection stroke and after a predetermined quantity of fuel has flowed back towards the injection pump, and the pump also includes in each outlet, a pressurizing valve which includes a valve member which is spring loaded to maintain the column of fuel intermediate the pressurizing valve and the delivery valve under the pressure thereby to prevent the formation of cavities within the column of fuel.
Inventors
- 👤 Moshe Drori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:06
CPC Classifications
F; F02; F02M; F02M41/00; F02M41/08; F02M41/14; F02M41/1405; F02M41/1411; F02M41/1427; F02M59/00; F02M59/44; F02M59/46; F02M59/462; F02M2041/1438; F02M2041/1455; F02M2041/1472; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87917; Y10T137/88054
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
174 words
A liquid fuel pumping apparatus of the kind intended to supply fuel to an internal combustion engine and comprising in combination an injection pump adapted to be driven in timed relationship with the associated engine, a rotary distributor member including a delivery passage connected to the outlet of the injection pump, the distributor member being driven in timed relationship with the engine, a plurality of outlet ports being formed in a body surrounding the distributor member and with which the delivery passage registers in turn during successive delivery strokes of the injection pump, a delivery valve located in said delivery passage and which is closed at the end of a delivery stroke of the injection pump and pressurizing valves located in the outlet ports respectively, said pressurizing valves acting to maintain fuel contained in the portions of the delivery passage and the associated outlet port and the end of the delivery stroke of the injection pump, under pressure at least until the delivery passage has been moved out of register with the outlet port.
Claim 2
Dependent Claim
174 words
A liquid fuel pumping apparatus of the kind intended to supply fuel to an internal combustion engine and comprising in combination an injection pump adapted to be driven in timed relationship with the associated engine, a rotary distributor member including a delivery passage connected to the outlet of the injection pump, the distributor member being driven in timed relationship with the engine, a plurality of outlet ports being formed in a body surrounding the distributor member and with which the delivery passage registers in turn during successive delivery strokes of the injection pump, a delivery valve located in said delivery passage and which is closed at the end of a delivery stroke of the injection pump and pressurizing valves located in the outlet ports respectively, said pressurizing valves acting to maintain fuel contained in the portions of the delivery passage and the associated outlet port and the end of the delivery stroke of the injection pump, under pressure at least until the delivery passage has been moved out of register with the outlet port.
Claim 3
Dependent Claim
22 words
The apparatus as claimed in claim 1 in which the valves each include a valve member loaded by a coiled compression spring.
Claim 4
Dependent Claim
55 words
The apparatus as claimed in claim 2 in which the quantity of fuel displaced by the delivery valve is less than that displaced by the pressurizing valve thereby ensuring that the valve member of the delivery valve completes its movement at the end of an injection stroke before the valve member of the pressurizing valve.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |